Multiple-drill press.



PATENTED JUNE 25, 1907. t w. 0. TOON.

MULTIPLE DRILL PRESS.

APPLICATION FILED'SEPT.26,1906.

rnvirnn STATES PATENT OFFICE.

MULTIPLE-DRILL PRESS.

Specification of Letters Patent.

Patented June 25, 1907.

Application filed September 26,1906. $erial No. 336,287.

['0 (Ali wit/1111, 71/ Tim/y cancer/t.-

Be it known that I, WILLIAM C. TooN, a citizen of the United States,residing at Ohicage, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Multiple-Drill Presses,of which the following is a specification.

My invention relates to improvements in multiple drill presses, and moreparticularly to the fittings of such presses comprising the means forsupporting and adjusting the drill spindle.

In multiple drill presses it is customary to provide for each drillspindle a head wherein the spindle rotates, and a bracket, adjustablyconnected to the frame of the press, and

supporting the head, which is vertically adjustable thereon. Suchgeneral arrangement of parts is maintained in my invention, but Iprovide such construction and arrangement of parts as to accomplish thefollowing objects to minimize the width of the combined head and bracketfor any given style of drill, to prevent lateral bending of the headunder severe strain; to facilitate application of the head to, and itsadjustment relative to, the bracket to provide against wearing of thehead, so that it may be practically indestructible, to provide readilyremovable bushings for taking the wear; to provide in the device an oilreservoir which will supply the spindle bearings with oil for aconsiderable length of time; and to so ar range the parts that the headis reversible on the bracket.

Other and further objects may best be understood from the followingdescription,

, view.

taken in conjunction with the accompanying drawing, wherein;

Figure 1 is a side elevation of the bracket, head, and spindle fittings.Fig. 2 is a plan Fig. 3 is an enlarged vertical section of one end ofthe spindle and head, and, Fig. 4 is an enlarged detail.

Throughout the drawing like numerals of reference refer always to likeparts.

The bracket 10 comprises a slotted arm 11, of usual configuration,adapted for attachment to the frame of a multiple drill-press, and abody 12, extending at substantially right angles to the arm 11 andthroughout its front edge grooved, as at 13, and oppositely chamfered asat 1414, from the edges of the groove to the sides of the body. A slot,15, extending longitudinally of the body, to open communication betweenthe groove 13 and the rear face of the body is also provided.

The head, 16, which, as usual, is of relatively soft metal, such asbrass, is preferably of about the length and width of the bracketbody,and is provided along its rear edge with a tongue 17, shaped to fitsmoothly in the groove, 13. and flanked by angular grooves, 13, intowhich the chamfered portions 14 of the bracket body fit. At differentpoints in its length the tongue 17 is provided with screw holes 19, intowhich may take screws 20, taking through the slot 15 and binding on thebody 12 of the bracket, to secure the body and head firmly together.Obviously adjustment of the head relative to the body through quite arange may readily be accomplished.

From the front of the head extend bearing projections 21, bored as at 22for the loose reception of a spindle, and at their opposite endscounterbored as at 23 to a suitable depth. In the counterbores 23 areseated, with tight fit, bushings 24, of hard metal, preferably flangedas at 25 at their outer ends and grooved annularly to form a ball racefor a thrust-bearing. The bushings 24 are of less depth than thecounterbores 23, to leave open portions 23 of the counterbores, whichserve as oil channels. Through the head is provided a channel 26, closedat one end by a screw plug 27, and having communication through smallholes 28 with the channels 23, so that oil supplied to'the open upperend of the channel 26 may flow to the channels 23 to oil the bearings.

30 indicates the spindle, near each end fitted with a collar 31, groovedto form a ball race, and at its opposite extremities fitted, in anyusual manner, with a flexible joint connection 32 and a tool holder 33.

Balls 34 interposed between the collars 32 and bushing-flanges 25complete the ball thrust bearings. I

In operation the head is secured to the bracket in proper position ofadjustment by one or more of the screws 20, and when so secured isfirmly held against lateral distortion by the engagement of the tongue17 in the groove 13, the annular joints between the bracket and head onboth sides of the tongue, aiding in binding the parts accurately andpreventing strain from being localized on the tongue. The hardenedbushings 24, which alone receive the Wear incident to the rotation ofthe spindle, may be readily tempered to best withstand such wear, andprevent the destruction of the head by enlargement of the lower end ofthe spindle aperture through its projections 21, which takes place inordinary heads. Further, since the wear is particularly severe on thelower bearing, the life of the complete fitting may be lengthened byreversal of the head, which may be accomplished with only the removal ofthe plug 27 from one end of the oil channel to the other, and, ofcourse, the turning of the spindle end for end.

The bushings, when worn, may be removed, by inserting through the bore22 a tool with an expansion head to engage under the'end of the bushingand permit its being driven out.

Having thus described my invention, what I claim and desire to secure byLetters Patent of the United States, is:

1. The combination with a bracket having a body grooved along its frontedge, and slotted through its rear edge on the line of the groove, of areversible head provided with a tongue for engagement in the groove, anda screw, taking through the slot, engaging the tongue.

2. In a drill press, a spindle supporting arm provided with a spindlereceiving opening counterbored at each end, said arm provided with alubricating-oil reservoir having conduits leading to said counterbores,spindle thrust bearings seated in said counter bores, shouldered neartheir outer ends to provide enlargements for annular grooves for balls,and a spindle having enlargements on its respective ends in which toprovide an'nular grooves for the respective coacting members of saidbearings, and balls in said grooves.

In testimony whereof I hereunto set my hand in the presence of twowitnesses.

' WILLIAM C. TOON.

In the presence of- J. F. HARDY,

WV. A. BERNARD.

